Pepsin acts on proteins in the stomach. Explain how its optimum pH is suited to its working environment

Answers

Answer 1
The reason pepsin functions best at pH 2 is because the carboxylic acid group on the amino acid in the enzyme's active site must be in its protonated state, meaning bound to a hydrogen atom. At low pH the carboxylic acid group is protonated, which allows it to catalyze the chemical reaction of breaking chemical bonds

Related Questions

An air mass formed in Northern Canada moves into United States what type of air mass is this most likely to be in and what affect will have on the weather in the US

Answers

Answer : Radiational Cooling

Explanation: Continental polar (cP) or continental arctic (cA) air masses are cold, dry, and stable. These air masses originate over northern Canada and Alaska. They move southward, east of Rockies into the Plains, then eastward.

What fat measurement corresponds to low-fat ice cream?.

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Low-fat (1 percent) ice cream has three grams or less of fat.

Hope this help

The spreading out of molecules from a center of higher concentration is the result of.

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We have that the spreading out of molecules from a center of higher concentration is the result of Diffusion

Diffusion

Diffusion

Generally,  Diffusion is the movement of mainly gaseous bodies from an area where it is at higher concentration to  an area where it is  at lower concentration.

Therefore, The spreading out of molecules from a center of higher concentration is the result of Diffusion as seen in the definition

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The Mexican long-nosed bat roosts in Big Bend National Park in West Texas. The bat feeds on nectar and pollen and hovers while it feeds. Additionally, its tongue can extend up to eight centimeters. The features of Mexican long-nosed bats are evidence of natural selection because the features are adaptations that — lead to an increase in predation by other species of animals lead to an increase in predation by other species of animals show that most DNA mutations are necessary and advantageous but do not increase survival or reproductive success show that most DNA mutations are necessary and advantageous but do not increase survival or reproductive success help individuals outcompete other individuals for food resources to increase survival and reproductive success help individuals outcompete other individuals for food resources to increase survival and reproductive success are the result of intentional breeding

Answers

Natural selection results in adaptation, increasing in the individual's fitness. Option C. Features are adaptations that help individuals outcompete other individuals for food resources to increase survival and reproductive success.

What is natural selection?

Natural selection is an evolutive force.

It selects beneficial alleles in a population and increases their frequency.

It is the result of the phenotype-environment interaction which determines gene destiny in space and time.

Natural selection results in adaptation, meaning that it causes an increase in the aptitude phenotype.

Aptitude (or fitness) is reflected by the phenotype that results in the survival, fertility, and capability of having a mate. It is a way of measuring the individual ability to leave fertile offspring.

In many cases adaptations, resulting from natural selection can be correlated to environmental factors or selective pressures applied by other organisms or habitats.

In the exposed example, the features are adaptations that help individuals outcompete other individuals for food resources to increase survival and reproductive success.

selective pressure ⇒ competition for resources

influence in fitness ⇒ increase survival and reproductive success.

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Organisms that have only one chromosome of each type are called.

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Haploid refers to a cell or an organism that has only a single set of chromosomes. This is to be contrasted with diploid. "Di" means two, of course. So most animal cells and plant cells are diploid.

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The second heart sound is heard during which phase of the cardiac cycle?.

Answers

We have that the  second heart sound is heard when the semilunar valves opens.

Cardiac Cycle

The cardiac cycle is simply defined as the complete process of the  human heart from the beginning of one heartbeat to the beginning of the next.

Generally, the second heart sound is associated with the opening of the semilunar valves.

Therefore, when the semilunar valves opens.

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Which enzyme catalyzes the addition of nucleotides to a growing dna chain?.

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Answer:

One of the key molecules in DNA replication is the enzyme DNA polymerase. DNA polymerases are responsible for synthesizing DNA: they add nucleotides one by one to the growing DNA chain, incorporating only those that are complementary to the template.

Explanation:

Why is the order of amino acids important?

Answers

Answer:

Because its the primary structure of the protein

Explanation:

25 POINTS! What type of inheritance would you have if the cross between a purple flowered plant and a white flowered plant produced lavender flowers?

A: Recessive
B: Incomplete dominance
C: Codominance
D: Simple dominance

Answers

Answer:

b. incomplete dominance

Explanation:

its incomplete dominance because neither parent phenotype is visible but both phenotypes are instead "blended". purple + white = lavender

Which of the following is NOT one of the six basic crystal systems?

1- monoclinic
2-triclinic
3-diclinic
4- cubic

Answers

Answer:

6 Crystal Systems:

Triclinic, Monoclinic, Rhombic, Hexagonal and Trigonal, Tetragonal and Cubic.

The correct answer is 3. diclinic

What are the two types of fermentation?

Answers

Answer:

Alcoholic fermentation and lactic acid fermentation.

Explanation:

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______ are drugs that liquefy and dilute viscid secretions of the respiratory tract, thereby helping to evacuate those secretions.

Answers

Answer:

I believe the answer to this question is “expectorants”.


I hope this helps.

I need help pls help me

Answers

Answer:

Its C. They divide by mitosis since one paramecium cell divides into two genetically identical offspring, or daughter cells.

please help!!!





need this asap!




due today pls!!

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Answer:

A lymphocyte is a type of white blood cell that is part of the immune system. ... The B cells produce antibodies that are used to attack invading bacteria, viruses, and toxins. The T cells destroy the body's own cells that have themselves been taken over by viruses or become cancerous.

How does carbon enter the biotic components of the carbon cycle?
A) through the process of respiration
B)through the process of photosynthesis
C)through the combustion of fossil fuels
D) through decomposition of dead organisms

Answers

In the carbon cycle, plants take CO2 from the atmosphere and carry out photosynthesis by which they incorporate carbon into the biotic components of organic compounds.

What is the carbon cycle?

It is a biogeochemical cycle that starts with carbon dioxide in the atmosphere, which is adsorbed together with the sun's energy in the photosynthesis process of plants.

Characteristics of the carbon cycle

During the day, plants use the Sun's energy to convert CO2 from the atmosphere plus water into carbohydrates and oxygen,  this process is photosynthesis.

Therefore, we can conclude that the carbon cycle is a cycle that flows through the terrestrial ecosystem, through the photosynthesis of plants, by animals or decomposing organisms, and the oceans.

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Which of the following is not released by trees into the atmosphere? a. Oxygen b. Water vapor c. Ozone d. None of the above Please select the best answer from the choices provided A B C D.

Answers

B i think becaus the others are true
The answer is C.
Ozone is a layer around the earth doesn’t have to do with trees

Darwin's Theory
Project: Analyzing the Effects of the Environment on Traits
Active

Answers

The environment will effect the different traits a animal gets or develop. For example if a bird were to eat a hard shelled nut then they would need a hard beak or a big enough beak to break the nut. If they have shell-less nuts then they can have a smaller beak. Normally the development will benefit the animals.

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How do Codominance and Incomplete dominance affect the inheritance of traits? Question 5​

Answers

In both codominance and incomplete dominance, both alleles for a trait are dominant. In codominance a heterozygous individual expresses both simultaneously without any blending. Incomplete dominance is when the phenotypes of the two parents blend together to create a new phenotype for their offspring.

What can be used to measure primary productivity in an ecosystem?(1 point)
carbon dioxide consumption
water consumption
oxygen consumption
sugar consumption

Answers

Carbon dioxide consumption

Carbon dioxide consumption can be used to measure primary productivity in an ecosystem.

Primary productivity refers to the rate at which energy is converted to organic material by photosynthesis.

Primary productivity can be calculated by analyzing the change in biomass of producer organisms.

Primary productivity can also be calculated by analyzing the movement of carbon dioxide (consumption).

Primary productivity can also be estimated by analyzing the movement of carbon dioxide the movement of oxygen over time.

In conclusion, carbon dioxide consumption can be used to measure primary productivity in an ecosystem.

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According to your cladogram, what species are dragonflies most closely related to? How
do you know?

Answers

Dragonflies are closely related to the flies. They have more traits in common. THE LANCELET'S DNA. IT'S THE ORGANISMS WITH LEAST TRAITS IN COMMON AND FARTHEST IN THE CLADOGRAM.


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Question 17 of 20
Which of these descriptions most likely represents a human community with
the highest death rates due to disease?
A. Low population density, less access to technology
B. High economic status, more access to technology
C. Low economic status, more access to technology
O D. High population density, low economic status
SUBMIT

Answers

I think it is D because of the question

D because a large group of people need to go to a doctor, some can’t afford to go go to a hospital with high technology access, and if there is a low economy hospitals aren’t getting high tech gadgets

The surface along which the crust moves is called a fracture.
True
False

Answers

Answer:

False.

Explanation:

Faults are cracks in the earth's crust along which there is movement.

Answer:

False

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Dynamic equilibrium is detected by receptor regions called . 2. Static equilibrium receptors are located in the vestibular apparatus branch called . 3. Static equilibrium is detected by receptors within membranous sacs called maculae. 4. Dynamic equilibrium receptors are located in the vestibular apparatus branch called . 5. The bending of dynamic equilibrium receptors is caused by the gelatinous cap called the . 6. The bending of static equilibrium receptors is caused by tiny stones called

Answers

Receptors placed in the different areas of the vestibular apparatus detect the types of equilibriums. 1) crista ampullaris, 2) utricle and saccule, 3) maculae, 4) semicircular canals, 5) cupula, 6) otoliths.

How is the vestibular apparatus composed?

Three main areas compose the vestibular apparatus. These are the

utricle, saccule, and semicircular canals.

What are the different types of equilibriums?

The vestibular apparatus detects two types of equilibriums,

The static equilibrium → Head and body position relative to gravity

The dynamic equilibrium → Head and body position relative to rotational acceleration and deceleration.

These types of equilibriums are detected by receptors placed in different areas of the vestibular apparatus.

Static equilibrium receptors are located in the macula of the utricle and saccule. They help to maintain balance.

Dynamic equilibrium receptors are located in the semicircular canals. They provide information about the rotational movement.

The sensory hairs are located in the crista of the ampulla, at the base of each canal (crista ampullaris).

The sensory hairs are covered by a dense gelatinous material named cupula, the otolithic membrane.

The otoliths are calcium carbonate crystals placed over the cupula. Their movements depend on the head’s movements.

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The _______ of a sensory receptor may be irregular in shape and overlap with those of neighboring receptors. The size of this area determines the sensitivity to a stimulus.

Answers

Answer:

The receptive field

Explanation:

Quizlet

Did anyone take this quiz???

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Nope, but that is VHS learning site! What is it on?

An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain

Answers

Answer: 16 neutrons

Explanation:

Mass-atomic number

31-15=16

16 neutrons
This is the isotope phosphorus-31. It has 15 protons, 15 electrons, and 16 neutrons.

What is the main source of energy for cellular respiration.

Answers

Answer: Glucose

Explanation: Glucose is used for all plants and animals to create energy via means of cellular respiration. The glucose is broken down into useable energy with the help of oxygen and other important molecules.

10. What happens when a cell reproduces?
A. Two similar daughter cells are created.
B. One mother cell and one daughter cell are created.
C. One mother and two similar daughter cells are created.
D. One father and one mother cell are created.

Answers

Answer:

A

Explanation:

Through the process of Mitosis (form of cell division that produces cells, such as Skin cells). A parent cell splits, creating two daughter cells.

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Although bacteria and other single-celled organisms can produce genetically identical offspring. they sometimes still exchange DNA be passing it from bacteria to bacteria. What might be the advantage of exchanging DNA in this way?

p​

Answers

Answer:

Bacteria, like all living organisms, have evolved at least one autonomous mechanism, conjugation, for exchanging portions of genetic materials between two related cells. The ecological benefits of conjugation include the expansion of metabolic versatility and resistance to hazardous environmental conditions.

Explanation: Hope this helps

How do antibiotics work own words

Answers

Answer=

Antibiotics work by interrupting critical bacterial activities, killing or preventing germs from growing.  

Explanation:

The body's natural immune system is aided in fighting bacterial infection as a result of this. Antibiotics are effective against a variety of germs and They do this by either killing the bacteria or preventing them from replicating or duplicating themselves.

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